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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510 >> DTC P0671-P0678 >> Circuit/System Verification

Circuit/System Verification

  1. Refer to Testing for Intermittent Conditions and Poor Connections if you cannot duplicate the conditions.
    • If DTC P064C is also set, diagnose DTC P064C first.
  2. Engine running, observe the DTC information with a scan tool. DTCs P0671-P0678 should not set.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.
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